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# The probability that a visitor at the mall buys a pack of

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Manager
Joined: 30 Jul 2007
Posts: 130
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The probability that a visitor at the mall buys a pack of [#permalink]  10 Sep 2008, 17:37
The probability that a visitor at the mall buys a pack of candy is 30%. If three visitors come to the mall today, what is the probability that exactly two will buy a pack of candy?

* 0.343
* 0.147
* 0.189
* 0.063
* 0.027
VP
Joined: 05 Jul 2008
Posts: 1433
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Re: m04 - probability candy [#permalink]  10 Sep 2008, 17:44

So its 3/10 X 3/10 X 7/10

2 out of 3 can be picked in 3 C 2 ways

hence 3 X 3/10 X 3/10 X 7/10 = .189
Manager
Joined: 30 Jul 2007
Posts: 130
Followers: 2

Kudos [?]: 11 [0], given: 0

Re: m04 - probability candy [#permalink]  10 Sep 2008, 17:50
icandy wrote:

So its 3/10 X 3/10 X 7/10

2 out of 3 can be picked in 3 C 2 ways

hence 3 X 3/10 X 3/10 X 7/10 = .189

Cool. Thanks. That is the OA.
Re: m04 - probability candy   [#permalink] 10 Sep 2008, 17:50
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